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Intel
®
IXP42X Product Line of Network Processors and IXC1100 Control Plane Processor
September 2006 DM
Order Number: 252480-006US 567
AHB Queue Manager (AQM)—Intel
®
IXP42X product line and IXC1100 control plane processors
empty queues but until the queue configuration words have been set, this state is
somewhat inconsistent. Write accesses to any of the Queue Configuration Words 0-31
cause the corresponding queue status to be communicated on the Flag Bus. Once the
AQM is fully configured, these configuration words should be used for read only
purposes to monitor queue pointers. If a queue needs to be reset, a pair of operations
are required. First the appropriate queue status flags must be configured then the
Queue Configuration Word must be set. The data format for the Queue Configuration
Word is shown in the QUECONFIG register.
Reading and/or writing to a queue where the queue configuration word has not been
initialized will produce undefined operations and may cause spurious parity errors and/
or data corruption of another queue.